Syringe



A. E. SMITH Nov. 9, 1937.

SYRINGE Filed April 3, 1935 INVENTQR. ARTHUR EYSM/TH.

n .r, Y 4

w yillnu A'QITO EY.

Patented Nov. 9, 1937 UNITED STATES PATENT OFFICE STRING! Arthur E. Smith, Los Angeles, Calif. Application April 3, 1935, SerlalNo. 14,499

4 Claims. (Cl. 128-418) This invention relates to syringes.

The general object of the invention is to provide a new ampule syringe which is of such nature that it can be used for a local anaesthesia,

- and other purposes, and wherein novel means is provided to prepare a fresh solution directly within the ampule.

A further object of the invention is to provide a novel syringe barrel and end member therefor.

Another object of the invention is to provide an improved ampule closure.

Other objects and the advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing wherein:

Fig. 1 is a central sectional view through a syringe embodying the features of my invention;

Fig. 2 is an enlarged fragmentary central sectional view showing the improved ampule;

Fig. 3 is a view similar to Fig. 2 showing the plunger on the syringe in the act of causing the medicinaltablet to be ejected into the fluid in the ampule;

Fig. 4 is a fragmentary central sectional view showing the parts in a different relation;

Fig. 5 is a view similar to Fig. 2 showing a modified form of ampule closure;

Fig. 6 is a fragmentary central sectional view showing the modified ampule in Fig. 5 and parts of the syringe; and,

Fig. 7 is a fragmentary central sectional view showing the syringe and modified form of ampule closure.

Referring to the drawing by reference characters I have shown my invention as embodied in a syringe indicated generally at I ll. As shown this syringe includes a barrel l I having an end closure l2 thereon which is threaded as at It and which fits the threads on the end of the barrel. The closure I2 is provided with a plunger it which has a head it thereon and the closure includes a lower portion it which is adapted to engage the upper edge I! of the ampule ll shown as arranged in the barrel.

The front end of the barrel is provided with a front member 20 which is threaded to the barrel and which includes a recess 2| in which an end member 22 is slidably mounted. This and member 22 has a needle 22 thereon and the cylindrical portion is provided with a slot 24 into which pins 25 on the front member 2. extend.

The slots 24 are curved so that as the end member 22 is rotated it is withdrawn from or ad- 55 vanced into the front member 22. The needle 22 as shown includes sharpened portion 28 which in its inner position is within the barrel of the syringe, as shown in Figure 4.

The ampule It at one end is shown as provided I with a reduced portion 21 on which an elastic 5 rubber cap closure'28 is -mounted. When the ampule is in thebarrel and when the parts are in the position shown in Fig. 4, the point 26 of the needle pierces the closure 28 to aflord communication between the interior of the ampule 10 and the needle. The rear of the ampule is engaged by the lower end of the closure I 2, as shown in Fig. 3, when the parts are in operating position.

In the end of the ampule remote from the clos- 15 ure cap 28, I provide a rubber closure 30 which includes a body portion having an inwardly directed skirt 3|, the lower portion of which is shaped to form a feather edge and the upper portion of which is provided with a protuberance 20 32. The closure 30 is provided with a chamber 33 in which a medicinal preparation 34 shown in the nature of a tablet is inserted. The wall of the chamber 33 is provided with a peripheral groove 35 in which is a disk 36, which may be 25 made of celluloid, and which is seated in the groove and which may be tightly held in place by the resiliency of the closure to thus protect the medicinal preparation 24 from the liquid in the ampule. 30

In operation, the ampule is inserted in the syringe barrel as shown in Fig. 1. The rear member 12 is then screwed down to engage the end of the ampule and as it does this the plunger It strikes the protuberance 22 and forces this 35 protuberance downwardly into the ampule. The elasticity of the rubber from which the closure 20 is made causes the walls defining the chamber 22 to flare outwardly thus releasing the disk and allowing the medicinal tablet to drop into the 40 liquid in the ampule. After this is done the end member 22 may be rotated causing it to advance in the front member 20 and causing the needle point 26 to pierce the wall of the closure 22 and thus prepare the syringe for use.

To hold the front member in its inner position I may provide a clip 40 which has a tongue 4| thereon which fits a corresponding aperture in the front member 20.

In the modification shown in Figs. 5, 6 and 7 the rear closure is an ordinary cylindrical stopper 45 while the front closure 46 includes a body having a tapering inner skirt 41 and having a flange II which engages the end of the ampule. The closure is provided with a chamber It whichhasapairofspacedgrooves II and II therein. In these grooves, disks I! and It are resiliently seated. Between the disks It and I! I arrange a medicinal preparation in the form of a tablet I4 and outwardly from. the disk II I provide an aperture II. The syringe tlshowninl'igjissimilartothesyringe ll except that the needle Cl is provided with a blunt end ll. i

Inuse,theampuleisplacedinthebarreiwith the blunt end I! engaging the disk II. The end member I is then placed in position so that it engages the end of the ampule and forces the opposite end of the ampule and the protuberance 0' against the front member ll of the syringe. This causes the protuberant portion to move inwardly thereby releasing the disks and at the same time eifeoting a tight seal for engagement with the peripheral bead 01 on the front member of the syringe. After this is done the front portion 04 is rotated so that the blunt end of the needle '2 enters the ampule. In case the disks have not been completely unseated the blunt end 02 of the needle will cause this unseat- From the foregoing description it will be allparent that I have invented a novel syringe and ampule which can be economically manufactured and which is highly efficient in use.

Having thus described my invention, I claim:

1. An ampule comprising a cylindrical body having a movable closure at one end, a fixed closure at the other end, one of said closures including a resilient body having a peripheral wall engaging said ampule and having a chamber therein, a depressible protuberance on said closure outwardly of said chamber and in align-w ment therewith, a preparation in said chamber,

and a disk forming the outer wall of said chamber, said disk being resiliently engaged by said closure whereby when the protuberance is depressed the disk is freed.

.2. An ampule comprising a cylindrical body having a closure therein at one end, said closure being made of rubber and including a body having a portion. engaging said ampule and having a chamber therein opening into the ampule, a disk closing said opening, a flexible portion on said closure adjacent said chamber, a preparation in said chamber, said flexible portion being depressible to expand the wall of the chamber and release said disk.

3. An ampule comprising a cylindrical body having a movable closure therein at one end, a fixed closure at the other end, one of said closures being made of rubber and including a body having a peripheral wall engaging said ampule and having a chamber therein opening into the ampule, a depressible protuberance on said closure and projecting outwardly, a preparation in said chamber, and a disk resiliently engaging the wall of said chamber, said protuberant portion being depressible to expand the wall of the chamber. and release said disk.

4. An ampule comprising a cylindrical body having a movable closure at one end, a fixed closure at the other end, one of said closures including a resilient body having a peripheral wall engaging said ampule and having a chamber therein, a depressible protuberance on said closure outwardly of said chamber, a preparation in said chamber and a seal forming the outer wall of said chamber, said seal being resiliently engagedby said closure whereby when the protuberance is depressed the seal is freed.

ARTHUR E. SMITH. 

